Question 1

Which of the following membrane components is most abundant in the plasma membrane by mass?

Accepted Answer

Lipids

Question 2

Refer to the diagram in the first image. Which letter (A-E) represents an integral membrane protein?

Accepted Answer

E

Question 3

Which of the following changes would increase membrane fluidity at low temperatures?

Accepted Answer

Increasing the proportion of unsaturated phospholipids

Question 4

Cholesterol in animal cell membranes primarily functions to:

Accepted Answer

Prevent the membrane from becoming too fluid at high temperatures

Question 5

Which of the following best describes the difference between integral and peripheral membrane proteins?

Accepted Answer

Integral proteins are embedded within the lipid bilayer, while peripheral proteins are attached to the membrane surface.

Question 6

A cell is placed in a solution with a higher concentration of solute than inside the cell. What will happen to the cell?

Accepted Answer

It will shrink as water leaves the cell.

Question 7

Which of the following equations correctly represents the net movement of water across a semipermeable membrane due to osmosis?

Accepted Answer

$$J = -L_p (\Delta P - \sigma \Delta \pi)$$

Question 8

Which of the following statements about passive transport is correct?

Accepted Answer

Passive transport includes both simple diffusion and facilitated diffusion.

Question 9

A plant cell is placed in a hypotonic solution. Which cellular structure prevents it from lysing?

Accepted Answer

Cell wall

Question 10

Which of the following best explains why animal cells shrink in hypertonic solutions?

Accepted Answer

Water moves out of the cell by osmosis.

Question 11

Which side of the membrane (Side 1 or Side 2) faces the extracellular environment?

Accepted Answer

Side 1

Question 12

Which of the following is a function of membrane carbohydrates?

Accepted Answer

Acting as identification markers for cell-cell recognition

Question 13

Which of the following would most likely increase the rate of facilitated diffusion across a membrane?

Accepted Answer

Increasing the number of transport proteins

Question 14

Which of the following best describes the role of glycoproteins in the plasma membrane?

Accepted Answer

They serve as cell identity markers.

Question 15

Which of the following statements about the sodium-potassium pump is correct?

Accepted Answer

It requires ATP to function.

Question 16

Which equation best represents the change in free energy for diffusion of a solute across a membrane?

Accepted Answer

$$\Delta G = RT \ln \left( \frac{[C]_2}{[C]_1} \right)$$

Question 17

Which of the following mechanisms is responsible for bulk transport of materials out of the cell?

Accepted Answer

Exocytosis

Question 18

Which of the following would decrease the fluidity of a membrane at room temperature?

Accepted Answer

Increasing the proportion of saturated fatty acids

Question 19

Which of the following statements about selective permeability is correct?

Accepted Answer

The plasma membrane allows some substances to pass more easily than others.

Question 20

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

Their hydrophilic heads interact with water, while hydrophobic tails avoid water.

Structure and Function of Biological Membranes

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